US Patent 9527780 Enhancing biochar performance using pyrolysis acid stream

A method of producing a modified biochar and the use of the biochar as a soil amendment. The modified biochar can be produced by contacting biochar with an acid-containing solution obtained from an acid containing stream produced in a pyrolysis process, which produces biochar. In accordance with one aspect, a cellulose-containing biomass is pyrolyzed to generate a gaseous organic acid-containing stream, which is condensed to produce an organic acid-containing solution. The biochar is then modified by contact with the organic acid-containing solution.